Lt. Dan can't go to space because he *might* get the measles, then Bill Paxton gets all sick up there. Maybe Tom Hanks is poisoning them, or they all have space dementia like Steve Buscemi.
Lt. Dan can't go to space because he *might* get the measles, then Bill Paxton gets all sick up there. Maybe Tom Hanks is poisoning them, or they all have space dementia like Steve Buscemi.